The Bitcoin is trading around $7,400. You anticipate the upcoming negative news about cryptocurrency
market, which will negatively impact the price of BTC, so you decide to sell ten Bitcoins at $7,400 for a
total short position of $74,000 in value.
Bitcoin has a margin requirement of 1% (1:100 leverage) so you need to deposit $74,000x1%=$740 as margin
collateral.
The announcement is a disappointing one, and the Bitcoin drops to $7,354. You’re ready to secure your
profit, so you buy back 10 BTC at $7,354
Because this is a short position, you deduct the closing price ($7,354) from the opening price ($7,400) of
your position to calculate profit, before multiplying by its size of 10.
7,400-7,354=46, which you multiply by 10 and get a profit of $460 because you had a “short”
position.